Investigation of edge fairing shaping effects on aerodynamic response of long-span bridge deck by unsteady RANS

Haque, Md. Naimul; Katsuchi, Hiroshi; Yamada, Hitoshi; Nishio, Mayuko

doi:10.1016/j.acme.2016.06.007

Cited by 42 publications

(7 citation statements)

References 26 publications

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“…Nagao et al [8] investigated the effect of the size of the triangular shape fairing on the aerodynamic behavior of the box girder. Similar studies were performed for the edge-box girder and trapezoidal box girder by Sukamta et al [9] and Hanque et al [10], respectively. Also, there are several types of fairing, such as the half-circular and the propeller type.…”

Section: Previous Researches and The Proposed New-supporting

confidence: 71%

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Moon

2021

Shock and Vibration

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In this study, new-type hybrid faring is suggested to improve the aerodynamic performance of the long-span cable-stayed bridge. The proposed fairing is developed by applying the concept of the multibox section to the normal faring. The proposed faring has void regions inside the faring so that wind passes through the gaps in the faring. As a result, the wind flow is changed and the forces to the bridge section are reduced. The efficiency of the proposed faring was verified by a series of wind tunnel test. From the test result, it can be found that aerodynamic performances, such as drag force and flutter resistance, are enhanced.

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Section: Previous Researches and The Proposed New-supporting

confidence: 71%

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Moon

2021

Shock and Vibration

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“…Therefore, to understand how the aerodynamic behaviour is affected by the shape of the deck at different wind angles of attack for ease of deck shaping procedures on bridge decks [19]. During a wind tunnel test, it was discovered that as the wind's angle of attack changed, dissimilar pressures were induced on the outside surfaces of the structure with the "+" shaped plan [20].In bridge aerodynamics, there are two ways to represent the mean wind load by using the structural coordinate, one of which is the wind coordinate, as shown in the given Fig.…”

Section: Introductionmentioning

confidence: 99%

Wind responses on twin box girder bridge deck using a fluid–structure interaction approach

et al. 2023

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Wind responses on a twin box girder bridge can be observed by a wind tunnel experiment or by having a full-scale setup if possible. Another possible approach is to go through a numerical approach, which is the CFD simulation of the atmospheric boundary layer surrounding the twin box girder bridge deck. A virtual wind tunnel CFD modelling simulation was carried out on the bridge deck using the Ansys Fluent FSI technique to nd out the displacement of the bridge deck. The steady-state simulations have been computed. The turbulence model was used to calculate the mean force coe cients as K-ω SST. It has been seen that steady simulation is needed to get the static aerodynamic coe cients right when modeling. Ansys ICEM CFD is used for meshing the bridge deck. In this study, the wind ow behaviour around the structure is analysed at different wind incident angles of -10°, -5°, 0°, 5°, and 10°. The pressure variations at different wind directions are mapped in the present work. Responses across and along the wind are also depicted. It has been found that the drag coe cient is higher at low angles of attack, whereas the moment and the lift coe cient are showing fewer values at large angles. Highlights 1. The pressure variations on the boundary of bridge deck.2. The displacement of the bridge deck due to wind pressure.3. The effect of different wind angles on ow variations around the bridge deck.

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“…Thus, measures are taken to prevent harmful vibrations (e.g., vortex, buffering, and flutter vibration) during the design stage, which include aerodynamic and structural dynamic methods. Aerodynamic methods include changing the flow of air by improving the aerodynamics of the girders with attachments such as fairing, spoilers, or flaps [1,2]. Structural dynamic methods include using devices such as the tuned mass damper (TMD) or active mass damper (AMD) to increase the damping of structures.…”

Section: Introductionmentioning

confidence: 99%

Active Mass Damper for Reducing Wind and Earthquake Vibrations of a Long-Period Bridge

Chang

2020

Actuators

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An active mass damper (AMD) was developed that uses a linear motor and coil spring to reduce the vertical vibration of a long-period cable-stayed bridge subjected to wind and earthquake loads. A scaled-down bridge model and AMD were fabricated, and the control effect of the AMD was investigated experimentally and analytically. The AMD was controlled via a linear quadratic Gaussian algorithm, which combines a linear quadratic regulator and Kalman filter. The dynamic properties were investigated using a 1/10 scale indoor experimental model, and the results confirmed that the measured and analytical accelerations were consistent. A vibrator was used to simulate the wind-induced vibration, and the experimental and analytical results were consistent. The proposed AMD was confirmed to damp the free vibration and harmonic load and increase the damping ratio of the bridge model from 0.17% to 9.2%. Finally, the control performance of the proposed AMD was numerically investigated with the scaled-down bridge model subjected to the El Centro and Imperial Valley-02 earthquakes. These results were compared with those of a TMD, and they confirmed that the proposed AMD could reduce excessive vertical vibrations of long-period cable-stayed bridges subjected to wind and earthquakes.

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Investigation of edge fairing shaping effects on aerodynamic response of long-span bridge deck by unsteady RANS

Cited by 42 publications

References 26 publications

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Wind responses on twin box girder bridge deck using a fluid–structure interaction approach

Active Mass Damper for Reducing Wind and Earthquake Vibrations of a Long-Period Bridge

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